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Few enter the cafeteria at Marysville-Pilchuck High School, where five freshmen were fatally shot six months ago, including the shooter, and one was wounded. The building stands off from the rest of campus, its gray doors locked.

When it comes to negotiating salaries, the research is pretty clear: women are less assertive than men. It's one reason women who start their careers with a narrower pay gap see it widen over time.

Carnegie Mellon economics professor Linda Babcock, who studies the gender pay gap, says men are four times more likely to negotiate their pay. That keeps women at a disadvantage, though they're not always aware of it.